During an appearance on Watch What Happens Live this week, the pregnant star defended her anti-vaccine stance as "the best decision" for her children with husband Jay Cutler.
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"We've got a lot of questions, Kristin, about your stand on vaccines," host Andy Cohen said. "Kat George wants to know, ‘How can you knowingly support the spread of potentially deadly diseases by not vaccinating your children?'"
"Here’s the thing," the reality star replied. "At the end of the day, I'm just a mum. I'm trying to make the best decision for my kid.
Kristin and her 19-month-old son Camden
"There are very scary statistics out there regarding what is in vaccines and what they cause – asthma, allergies, ear infections, all kind of things. And we feel like we are making the best decision for our kids."
Kristin, who is expecting her second baby in May, revealed her anti-vaccine stance earlier this month when she said she had chosen not to have son Camden immunised.
"You know what, I've read too many books about autism," she said on Fox Business show, The Independents. "There is a paediatric group called Homestead… or Home First… They’ve never vaccinated any of their children, and they’ve never had one case of autism."
The TV star and her husband Jay Cutler will welcome their second child in May
She later admitted that the public response to her comments had been "harsh", and that she hadn't planned to talk about it. "It's not something that I publicly wanted to come out and say," she explained. "I was in an interview and it came up, and it wasn't what I was expecting."
Kristin is not the only famous mum to share her anti-vaccine beliefs. Jenny McCarthy came under fire this month in relation to her thoughts on the subject.
It began when she innocently asked her 1.13 million Twitter followers, "What is the most important personality trait you look for in a mate?"
Jenny McCarthy has been vocal about her anti-vaccine stance
Some of the answers were unexpected to say the least. "Somebody who gets that refusing vaccines because of 'toxins' and then shilling for e-cigs makes you a pathetic hypocrite," one user replied, while another tweeted, "Someone who doesn't spread false info causing disease."
Jenny, 41, whose son Evan was diagnosed with autism in May 2005, had often argued that vaccines are linked to autism in children.
Jenny's son Evan was diagnosed with autism in 2005
In a 2008 interview with Larry King, she commented, "Isn't it ironic, in 1983 there were 10 shots and now there's 36, and the rise of autism happened at the same time?
"We need to get rid of the toxins, the mercury – which I am so tired of everyone saying it's been removed. It has not been removed from the shots."